One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10)(11,13)(12,14)(15,16) involution — undirected(1,3,5,4)(2,6,8,7)(9,11,12,15)(10,13,14,16)(18,22)(19,26)(20,28)(23,25)(27,29)(30,31)(1,3,5,4)(2,7,8,6)(10,14)(13,16)(17,18,21,25)(19,24,27,32)(20,23,28,22)(26,30,29,31)(1,4,5,3)(2,6,8,7)(18,23)(19,26)(20,28)(22,25)(24,32)(27,29)(17,19,21,27)(18,24,25,32)(20,29,28,26)(22,30,23,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.